Cybersecurity expert Jeffrey Carr says he has found several clues that link China to Stuxnet. He says Vacon, maker of one of the two frequency converter drives used in the Siemens programmable logic controller, doesn’t make its drives in its home country Finland, but rather in Suzhou, China. Microsoft signed an agreement with the Chinese government in 2006 that gives officials access to most of Microsoft products’ source code, including operating systems Windows 7, Vista, XP, and XP. Carr: “I’m fairly certain this was China-driven””]
Source: https://www.darkreading.com/attacks-breaches/china-likely-behind-stuxnet-attack-cyberwar-expert-says